Theory of strengthening in fcc high entropy alloys
Theory of strengthening in fcc high entropy alloys
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DOI：
10.1016/j.actamat.2016.07.040
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发表时间：
2016-10-01
期刊：
影响因子：
9.4
通讯作者：
Curtin, William A.
中科院分区：
文献类型：
--
作者：
Varvenne, Celine;Luque, Aitor;Curtin, William A.
高熵合金（HEAs）是一种新型的无规合金，具有令人印象深刻的强度和韧性。在这里，一个机械的，无参数的，预测理论的温度，成分，和应变率依赖的fcc HEAs的塑性屈服强度的介绍，验证，并应用于了解最近的实验。对于一阶，HEA中的每个元素组分被认为是嵌入在周围合金的有效基体中的溶质。然后，强化主要是由于位错与平均组成周围的随机局部浓度波动的相互作用而实现的。对模型Fe-Ni-Cr合金的分子模拟的理论进行了验证。Hall-Petch校正的屈服强度在Ni-Co-Fe-Cr-Mn fcc HEM，然后预测仅使用现有的实验信息，并实现了良好的定量协议。该理论证明了高强度的起源和详细的趋势与成分，材料参数，温度，从而确定关键的可测量/可计算的材料性能所需的设计和优化的面心立方HEAs，是一个通用的模型面心立方随机合金。(C)2016 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
High Entropy Alloys (HEAs) are a new class of random alloys having impressive strength and toughness. Here, a mechanistic, parameter-free, and predictive theory for the temperature-, composition-, and strain-rate-dependence of the plastic yield strength of fcc HEAs is presented, validated, and applied to understand recent experiments. To first order, each elemental component in the HEA is considered as a solute embedded in the effective matrix of the surrounding alloy. Strengthening is then mainly achieved due to dislocation interactions with the random local concentration fluctuations around the average composition. The theory is validated against molecular simulations on model Fe-Ni-Cr alloys. Hall-Petch-corrected yield strengths in Ni-Co-Fe-Cr-Mn fcc HEM are then predicted using only available experimental information, and good quantitative agreement is achieved. The theory demonstrates the origins of the high strength and detailed trends with composition, materials parameters, temperature, thus identifying the key measurable/calculable material properties needed for design and optimization of fcc HEAs, and is a general model for fcc random alloys. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.